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Molothrus bonariensis

Shiny Cowbird


Molothrus bonariensis

(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Conservation status according to BirdLife International: Least Concern


Description


It is a medium-sized bird with a robust build and upright posture, showing clear sexual dimorphism. The male displays glossy black plumage with bluish or purplish iridescence, while the female is much duller, with brownish to grayish tones and fine streaking. The bill is short, strong, and conical, suited to a varied diet, and the dark eyes give it an alert expression.

Geographic distribution: It is widely distributed throughout South America, with natural and human-facilitated expansion into Central America and parts of the Caribbean. It is one of the most widespread species within its genus.

Habitat: It primarily inhabits open and semi-open environments, such as grasslands, farmland, rural areas, city outskirts, and urban parks. Its high tolerance for human-altered landscapes has greatly contributed to its geographic expansion.

Feeding: This species is omnivorous, feeding mainly on seeds, grains, and small invertebrates such as insects and larvae. It often forages on the ground, alone or in groups, frequently taking advantage of resources associated with livestock and agriculture.

Behavior: It is a gregarious and opportunistic species, commonly seen in flocks, especially outside the breeding season. It shows confident and adaptable behavior, often frequenting areas with intense human activity. During reproduction, females exhibit particularly stealthy behavior.

Nesting: It has a distinctive reproductive strategy known as brood parasitism, as it does not build its own nest. Females lay their eggs in the nests of other bird species, which then incubate the eggs and raise the chicks. The young often grow rapidly and may outcompete or displace the host’s offspring.

Conservation status: It is classified as Least Concern, due to its wide distribution, large population size, and strong adaptability. No significant global threats are currently identified.


Author of this compilation: EcoRegistros – 22/12/2025





Geographic distribution


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Species photographs

Last published photographs

Foto
Photography ID: 601574
♂
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti
Foto
Photography ID: 601573
♂
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti
Foto
Photography ID: 601572
♂ ♀
  Adult

Santiago de chile
Región Metropolitana
Chile
06/24/2018
Adrian Braidotti
Foto
Photography ID: 598014
 
Purmamarca
Jujuy
Argentina
08/17/2024
Adrian Braidotti
Foto
Photography ID: 598013
 
Purmamarca
Jujuy
Argentina
08/17/2024
Adrian Braidotti
Foto
Photography ID: 583100
 
Puerto Madryn
Chubut
Argentina
04/16/2024
Adrian Braidotti
Foto
Photography ID: 535413
 
Puerto Madryn
Chubut
Argentina
04/22/2023
Adrian Braidotti
Foto
Photography ID: 475052
  Juvenile

Bialet Masse
Córdoba
Argentina
12/13/2021
Adrian Braidotti
Foto
Photography ID: 274316
♂ ♀
  Adult

Santiago de chile
Región Metropolitana
Chile
06/24/2018
Adrian Braidotti
Foto
Photography ID: 8321
♂
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti



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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
251956326/08/2026ArgentinaSan LuisReserva Florofaunística Ricón del Este, MerloAdrian Braidotti
251935426/08/2026ArgentinaSan LuisMerlo y alrededores, Villa de MerloAdrian Braidotti
251970624/08/2026ArgentinaLa RiojaTermas Aguas Calientes / Santa TeresitaAdrian Braidotti
251984122/08/2026ArgentinaLa RiojaParque de la Ciudad, La RiojaAdrian Braidotti
251981222/08/2026ArgentinaCatamarcaSan MartínAdrian Braidotti
250147126/07/2026ArgentinaSanta FeLaguna Melincué, MelincuéAdrian Braidotti
248846630/06/2026ArgentinaCórdobaBarrio Mirador del Lago, Bialet Masse3Adrian Braidotti
248825326/06/2026ArgentinaCórdobaArroyitoAdrian Braidotti
248839417/06/2026Dominican RepublicLa AltagraciaParque Nacional Cotubanamá (Parque Nacional del Este)Adrian Braidotti
243063007/02/2026ArgentinaSanta FeReserva natural Carancho Diablo, Luis PalaciosAdrian Braidotti
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) – Species account. Accessed from www.ecoregistros.org on 30/09/2026.